Which of the following is the national level system that provides annual national as well as state-level reliable estimates of feility and moality?

Since civil registration is deficient in India, a Sample Registration System (SRS) was staed in the mid-1960s to provide reliable estimates of bih and death rates at the national and state level. SRS now covers the entire country and is a major source of health information. Since the introduction of this system, more reliable information on bih and death rates, age-specific moality and feility rates, infant and adult moality, etc. have been available